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An HVAC Noise Analysis was conducted by Navcon Engineers for a new Portable School. The objective was to model the HVAC noise levels within the school. The study evaluate a number of building layouts to assess the impact from the exterior HVAC units. The following graphic shows a noise contour map and a cross sectional noise map. The maps shows one building layout where the class rooms were oriented back to back. The HVAC units are concentrate between school rooms. In this building layout the noise impact on the front side of the class rooms is considerably lower than on the back side.